4. f1e2  4... h7h6 A prophylactic move, giving a square back to the bishop. After the immediate 4...e6 White can grab the bishop with 5.Nh4, which is already one of the very few benefits offered by his opening system. 5. c1a3 White, in turn, exploits Black's slight delay in playing ...e7-e6 to place the bishop on a somewhat surprising diagonal, making Black's development a bit more difficult. 5... b8d7  6. e1g1 